(function () {
    'use strict';

    var ERROR = 'input is invalid type';
    var WINDOW = typeof window === 'object';
    var root = WINDOW ? window : {};
    if (root.JS_SHA256_NO_WINDOW) {
        WINDOW = false;
    }
    var WEB_WORKER = !WINDOW && typeof self === 'object';
    var NODE_JS = !root.JS_SHA256_NO_NODE_JS && typeof process === 'object' && process.versions && process.versions.node;
    if (NODE_JS) {
        root = global;
    } else if (WEB_WORKER) {
        root = self;
    }
    var COMMON_JS = !root.JS_SHA256_NO_COMMON_JS && typeof module === 'object' && module.exports;
    var AMD = typeof define === 'function' && define.amd;
    var ARRAY_BUFFER = !root.JS_SHA256_NO_ARRAY_BUFFER && typeof ArrayBuffer !== 'undefined';
    var HEX_CHARS = '0123456789abcdef'.split('');
    var EXTRA = [-2147483648, 8388608, 32768, 128];
    var SHIFT = [24, 16, 8, 0];
    var K = [
        0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
        0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
        0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
        0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
        0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
        0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
        0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
        0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
    ];
    var OUTPUT_TYPES = ['hex', 'array', 'digest', 'arrayBuffer'];

    var blocks = [];

    if (root.JS_SHA256_NO_NODE_JS || !Array.isArray) {
        Array.isArray = function (obj) {
            return Object.prototype.toString.call(obj) === '[object Array]';
        };
    }

    if (ARRAY_BUFFER && (root.JS_SHA256_NO_ARRAY_BUFFER_IS_VIEW || !ArrayBuffer.isView)) {
        ArrayBuffer.isView = function (obj) {
            return typeof obj === 'object' && obj.buffer && obj.buffer.constructor === ArrayBuffer;
        };
    }

    var createOutputMethod = function (outputType, is224) {
        return function (message) {
            return new Sha256(is224, true).update(message)[outputType]();
        };
    };

    var createMethod = function (is224) {
        var method = createOutputMethod('hex', is224);
        if (NODE_JS) {
            method = nodeWrap(method, is224);
        }
        method.create = function () {
            return new Sha256(is224);
        };
        method.update = function (message) {
            return method.create().update(message);
        };
        for (var i = 0; i < OUTPUT_TYPES.length; ++i) {
            var type = OUTPUT_TYPES[i];
            method[type] = createOutputMethod(type, is224);
        }
        return method;
    };

    var nodeWrap = function (method, is224) {
        var crypto = eval("require('crypto')");
        var Buffer = eval("require('buffer').Buffer");
        var algorithm = is224 ? 'sha224' : 'sha256';
        var nodeMethod = function (message) {
            if (typeof message === 'string') {
                return crypto.createHash(algorithm).update(message, 'utf8').digest('hex');
            } else {
                if (message === null || message === undefined) {
                    throw new Error(ERROR);
                } else if (message.constructor === ArrayBuffer) {
                    message = new Uint8Array(message);
                }
            }
            if (Array.isArray(message) || ArrayBuffer.isView(message) ||
                message.constructor === Buffer) {
                return crypto.createHash(algorithm).update(new Buffer(message)).digest('hex');
            } else {
                return method(message);
            }
        };
        return nodeMethod;
    };

    var createHmacOutputMethod = function (outputType, is224) {
        return function (key, message) {
            return new HmacSha256(key, is224, true).update(message)[outputType]();
        };
    };

    var createHmacMethod = function (is224) {
        var method = createHmacOutputMethod('hex', is224);
        method.create = function (key) {
            return new HmacSha256(key, is224);
        };
        method.update = function (key, message) {
            return method.create(key).update(message);
        };
        for (var i = 0; i < OUTPUT_TYPES.length; ++i) {
            var type = OUTPUT_TYPES[i];
            method[type] = createHmacOutputMethod(type, is224);
        }
        return method;
    };

    function Sha256(is224, sharedMemory) {
        if (sharedMemory) {
            blocks[0] = blocks[16] = blocks[1] = blocks[2] = blocks[3] =
                blocks[4] = blocks[5] = blocks[6] = blocks[7] =
                    blocks[8] = blocks[9] = blocks[10] = blocks[11] =
                        blocks[12] = blocks[13] = blocks[14] = blocks[15] = 0;
            this.blocks = blocks;
        } else {
            this.blocks = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
        }

        if (is224) {
            this.h0 = 0xc1059ed8;
            this.h1 = 0x367cd507;
            this.h2 = 0x3070dd17;
            this.h3 = 0xf70e5939;
            this.h4 = 0xffc00b31;
            this.h5 = 0x68581511;
            this.h6 = 0x64f98fa7;
            this.h7 = 0xbefa4fa4;
        } else { // 256
            this.h0 = 0x6a09e667;
            this.h1 = 0xbb67ae85;
            this.h2 = 0x3c6ef372;
            this.h3 = 0xa54ff53a;
            this.h4 = 0x510e527f;
            this.h5 = 0x9b05688c;
            this.h6 = 0x1f83d9ab;
            this.h7 = 0x5be0cd19;
        }

        this.block = this.start = this.bytes = this.hBytes = 0;
        this.finalized = this.hashed = false;
        this.first = true;
        this.is224 = is224;
    }

    Sha256.prototype.update = function (message) {
        if (this.finalized) {
            return;
        }
        var notString, type = typeof message;
        if (type !== 'string') {
            if (type === 'object') {
                if (message === null) {
                    throw new Error(ERROR);
                } else if (ARRAY_BUFFER && message.constructor === ArrayBuffer) {
                    message = new Uint8Array(message);
                } else if (!Array.isArray(message)) {
                    if (!ARRAY_BUFFER || !ArrayBuffer.isView(message)) {
                        throw new Error(ERROR);
                    }
                }
            } else {
                throw new Error(ERROR);
            }
            notString = true;
        }
        var code, index = 0, i, length = message.length, blocks = this.blocks;

        while (index < length) {
            if (this.hashed) {
                this.hashed = false;
                blocks[0] = this.block;
                blocks[16] = blocks[1] = blocks[2] = blocks[3] =
                    blocks[4] = blocks[5] = blocks[6] = blocks[7] =
                        blocks[8] = blocks[9] = blocks[10] = blocks[11] =
                            blocks[12] = blocks[13] = blocks[14] = blocks[15] = 0;
            }

            if (notString) {
                for (i = this.start; index < length && i < 64; ++index) {
                    blocks[i >> 2] |= message[index] << SHIFT[i++ & 3];
                }
            } else {
                for (i = this.start; index < length && i < 64; ++index) {
                    code = message.charCodeAt(index);
                    if (code < 0x80) {
                        blocks[i >> 2] |= code << SHIFT[i++ & 3];
                    } else if (code < 0x800) {
                        blocks[i >> 2] |= (0xc0 | (code >> 6)) << SHIFT[i++ & 3];
                        blocks[i >> 2] |= (0x80 | (code & 0x3f)) << SHIFT[i++ & 3];
                    } else if (code < 0xd800 || code >= 0xe000) {
                        blocks[i >> 2] |= (0xe0 | (code >> 12)) << SHIFT[i++ & 3];
                        blocks[i >> 2] |= (0x80 | ((code >> 6) & 0x3f)) << SHIFT[i++ & 3];
                        blocks[i >> 2] |= (0x80 | (code & 0x3f)) << SHIFT[i++ & 3];
                    } else {
                        code = 0x10000 + (((code & 0x3ff) << 10) | (message.charCodeAt(++index) & 0x3ff));
                        blocks[i >> 2] |= (0xf0 | (code >> 18)) << SHIFT[i++ & 3];
                        blocks[i >> 2] |= (0x80 | ((code >> 12) & 0x3f)) << SHIFT[i++ & 3];
                        blocks[i >> 2] |= (0x80 | ((code >> 6) & 0x3f)) << SHIFT[i++ & 3];
                        blocks[i >> 2] |= (0x80 | (code & 0x3f)) << SHIFT[i++ & 3];
                    }
                }
            }

            this.lastByteIndex = i;
            this.bytes += i - this.start;
            if (i >= 64) {
                this.block = blocks[16];
                this.start = i - 64;
                this.hash();
                this.hashed = true;
            } else {
                this.start = i;
            }
        }
        if (this.bytes > 4294967295) {
            this.hBytes += this.bytes / 4294967296 << 0;
            this.bytes = this.bytes % 4294967296;
        }
        return this;
    };

    Sha256.prototype.finalize = function () {
        if (this.finalized) {
            return;
        }
        this.finalized = true;
        var blocks = this.blocks, i = this.lastByteIndex;
        blocks[16] = this.block;
        blocks[i >> 2] |= EXTRA[i & 3];
        this.block = blocks[16];
        if (i >= 56) {
            if (!this.hashed) {
                this.hash();
            }
            blocks[0] = this.block;
            blocks[16] = blocks[1] = blocks[2] = blocks[3] =
                blocks[4] = blocks[5] = blocks[6] = blocks[7] =
                    blocks[8] = blocks[9] = blocks[10] = blocks[11] =
                        blocks[12] = blocks[13] = blocks[14] = blocks[15] = 0;
        }
        blocks[14] = this.hBytes << 3 | this.bytes >>> 29;
        blocks[15] = this.bytes << 3;
        this.hash();
    };

    Sha256.prototype.hash = function () {
        var a = this.h0, b = this.h1, c = this.h2, d = this.h3, e = this.h4, f = this.h5, g = this.h6,
            h = this.h7, blocks = this.blocks, j, s0, s1, maj, t1, t2, ch, ab, da, cd, bc;

        for (j = 16; j < 64; ++j) {
            // rightrotate
            t1 = blocks[j - 15];
            s0 = ((t1 >>> 7) | (t1 << 25)) ^ ((t1 >>> 18) | (t1 << 14)) ^ (t1 >>> 3);
            t1 = blocks[j - 2];
            s1 = ((t1 >>> 17) | (t1 << 15)) ^ ((t1 >>> 19) | (t1 << 13)) ^ (t1 >>> 10);
            blocks[j] = blocks[j - 16] + s0 + blocks[j - 7] + s1 << 0;
        }

        bc = b & c;
        for (j = 0; j < 64; j += 4) {
            if (this.first) {
                if (this.is224) {
                    ab = 300032;
                    t1 = blocks[0] - 1413257819;
                    h = t1 - 150054599 << 0;
                    d = t1 + 24177077 << 0;
                } else {
                    ab = 704751109;
                    t1 = blocks[0] - 210244248;
                    h = t1 - 1521486534 << 0;
                    d = t1 + 143694565 << 0;
                }
                this.first = false;
            } else {
                s0 = ((a >>> 2) | (a << 30)) ^ ((a >>> 13) | (a << 19)) ^ ((a >>> 22) | (a << 10));
                s1 = ((e >>> 6) | (e << 26)) ^ ((e >>> 11) | (e << 21)) ^ ((e >>> 25) | (e << 7));
                ab = a & b;
                maj = ab ^ (a & c) ^ bc;
                ch = (e & f) ^ (~e & g);
                t1 = h + s1 + ch + K[j] + blocks[j];
                t2 = s0 + maj;
                h = d + t1 << 0;
                d = t1 + t2 << 0;
            }
            s0 = ((d >>> 2) | (d << 30)) ^ ((d >>> 13) | (d << 19)) ^ ((d >>> 22) | (d << 10));
            s1 = ((h >>> 6) | (h << 26)) ^ ((h >>> 11) | (h << 21)) ^ ((h >>> 25) | (h << 7));
            da = d & a;
            maj = da ^ (d & b) ^ ab;
            ch = (h & e) ^ (~h & f);
            t1 = g + s1 + ch + K[j + 1] + blocks[j + 1];
            t2 = s0 + maj;
            g = c + t1 << 0;
            c = t1 + t2 << 0;
            s0 = ((c >>> 2) | (c << 30)) ^ ((c >>> 13) | (c << 19)) ^ ((c >>> 22) | (c << 10));
            s1 = ((g >>> 6) | (g << 26)) ^ ((g >>> 11) | (g << 21)) ^ ((g >>> 25) | (g << 7));
            cd = c & d;
            maj = cd ^ (c & a) ^ da;
            ch = (g & h) ^ (~g & e);
            t1 = f + s1 + ch + K[j + 2] + blocks[j + 2];
            t2 = s0 + maj;
            f = b + t1 << 0;
            b = t1 + t2 << 0;
            s0 = ((b >>> 2) | (b << 30)) ^ ((b >>> 13) | (b << 19)) ^ ((b >>> 22) | (b << 10));
            s1 = ((f >>> 6) | (f << 26)) ^ ((f >>> 11) | (f << 21)) ^ ((f >>> 25) | (f << 7));
            bc = b & c;
            maj = bc ^ (b & d) ^ cd;
            ch = (f & g) ^ (~f & h);
            t1 = e + s1 + ch + K[j + 3] + blocks[j + 3];
            t2 = s0 + maj;
            e = a + t1 << 0;
            a = t1 + t2 << 0;
        }

        this.h0 = this.h0 + a << 0;
        this.h1 = this.h1 + b << 0;
        this.h2 = this.h2 + c << 0;
        this.h3 = this.h3 + d << 0;
        this.h4 = this.h4 + e << 0;
        this.h5 = this.h5 + f << 0;
        this.h6 = this.h6 + g << 0;
        this.h7 = this.h7 + h << 0;
    };

    Sha256.prototype.hex = function () {
        this.finalize();

        var h0 = this.h0, h1 = this.h1, h2 = this.h2, h3 = this.h3, h4 = this.h4, h5 = this.h5,
            h6 = this.h6, h7 = this.h7;

        var hex = HEX_CHARS[(h0 >> 28) & 0x0F] + HEX_CHARS[(h0 >> 24) & 0x0F] +
            HEX_CHARS[(h0 >> 20) & 0x0F] + HEX_CHARS[(h0 >> 16) & 0x0F] +
            HEX_CHARS[(h0 >> 12) & 0x0F] + HEX_CHARS[(h0 >> 8) & 0x0F] +
            HEX_CHARS[(h0 >> 4) & 0x0F] + HEX_CHARS[h0 & 0x0F] +
            HEX_CHARS[(h1 >> 28) & 0x0F] + HEX_CHARS[(h1 >> 24) & 0x0F] +
            HEX_CHARS[(h1 >> 20) & 0x0F] + HEX_CHARS[(h1 >> 16) & 0x0F] +
            HEX_CHARS[(h1 >> 12) & 0x0F] + HEX_CHARS[(h1 >> 8) & 0x0F] +
            HEX_CHARS[(h1 >> 4) & 0x0F] + HEX_CHARS[h1 & 0x0F] +
            HEX_CHARS[(h2 >> 28) & 0x0F] + HEX_CHARS[(h2 >> 24) & 0x0F] +
            HEX_CHARS[(h2 >> 20) & 0x0F] + HEX_CHARS[(h2 >> 16) & 0x0F] +
            HEX_CHARS[(h2 >> 12) & 0x0F] + HEX_CHARS[(h2 >> 8) & 0x0F] +
            HEX_CHARS[(h2 >> 4) & 0x0F] + HEX_CHARS[h2 & 0x0F] +
            HEX_CHARS[(h3 >> 28) & 0x0F] + HEX_CHARS[(h3 >> 24) & 0x0F] +
            HEX_CHARS[(h3 >> 20) & 0x0F] + HEX_CHARS[(h3 >> 16) & 0x0F] +
            HEX_CHARS[(h3 >> 12) & 0x0F] + HEX_CHARS[(h3 >> 8) & 0x0F] +
            HEX_CHARS[(h3 >> 4) & 0x0F] + HEX_CHARS[h3 & 0x0F] +
            HEX_CHARS[(h4 >> 28) & 0x0F] + HEX_CHARS[(h4 >> 24) & 0x0F] +
            HEX_CHARS[(h4 >> 20) & 0x0F] + HEX_CHARS[(h4 >> 16) & 0x0F] +
            HEX_CHARS[(h4 >> 12) & 0x0F] + HEX_CHARS[(h4 >> 8) & 0x0F] +
            HEX_CHARS[(h4 >> 4) & 0x0F] + HEX_CHARS[h4 & 0x0F] +
            HEX_CHARS[(h5 >> 28) & 0x0F] + HEX_CHARS[(h5 >> 24) & 0x0F] +
            HEX_CHARS[(h5 >> 20) & 0x0F] + HEX_CHARS[(h5 >> 16) & 0x0F] +
            HEX_CHARS[(h5 >> 12) & 0x0F] + HEX_CHARS[(h5 >> 8) & 0x0F] +
            HEX_CHARS[(h5 >> 4) & 0x0F] + HEX_CHARS[h5 & 0x0F] +
            HEX_CHARS[(h6 >> 28) & 0x0F] + HEX_CHARS[(h6 >> 24) & 0x0F] +
            HEX_CHARS[(h6 >> 20) & 0x0F] + HEX_CHARS[(h6 >> 16) & 0x0F] +
            HEX_CHARS[(h6 >> 12) & 0x0F] + HEX_CHARS[(h6 >> 8) & 0x0F] +
            HEX_CHARS[(h6 >> 4) & 0x0F] + HEX_CHARS[h6 & 0x0F];
        if (!this.is224) {
            hex += HEX_CHARS[(h7 >> 28) & 0x0F] + HEX_CHARS[(h7 >> 24) & 0x0F] +
                HEX_CHARS[(h7 >> 20) & 0x0F] + HEX_CHARS[(h7 >> 16) & 0x0F] +
                HEX_CHARS[(h7 >> 12) & 0x0F] + HEX_CHARS[(h7 >> 8) & 0x0F] +
                HEX_CHARS[(h7 >> 4) & 0x0F] + HEX_CHARS[h7 & 0x0F];
        }
        return hex;
    };

    Sha256.prototype.toString = Sha256.prototype.hex;

    Sha256.prototype.digest = function () {
        this.finalize();

        var h0 = this.h0, h1 = this.h1, h2 = this.h2, h3 = this.h3, h4 = this.h4, h5 = this.h5,
            h6 = this.h6, h7 = this.h7;

        var arr = [
            (h0 >> 24) & 0xFF, (h0 >> 16) & 0xFF, (h0 >> 8) & 0xFF, h0 & 0xFF,
            (h1 >> 24) & 0xFF, (h1 >> 16) & 0xFF, (h1 >> 8) & 0xFF, h1 & 0xFF,
            (h2 >> 24) & 0xFF, (h2 >> 16) & 0xFF, (h2 >> 8) & 0xFF, h2 & 0xFF,
            (h3 >> 24) & 0xFF, (h3 >> 16) & 0xFF, (h3 >> 8) & 0xFF, h3 & 0xFF,
            (h4 >> 24) & 0xFF, (h4 >> 16) & 0xFF, (h4 >> 8) & 0xFF, h4 & 0xFF,
            (h5 >> 24) & 0xFF, (h5 >> 16) & 0xFF, (h5 >> 8) & 0xFF, h5 & 0xFF,
            (h6 >> 24) & 0xFF, (h6 >> 16) & 0xFF, (h6 >> 8) & 0xFF, h6 & 0xFF
        ];
        if (!this.is224) {
            arr.push((h7 >> 24) & 0xFF, (h7 >> 16) & 0xFF, (h7 >> 8) & 0xFF, h7 & 0xFF);
        }
        return arr;
    };

    Sha256.prototype.array = Sha256.prototype.digest;

    Sha256.prototype.arrayBuffer = function () {
        this.finalize();

        var buffer = new ArrayBuffer(this.is224 ? 28 : 32);
        var dataView = new DataView(buffer);
        dataView.setUint32(0, this.h0);
        dataView.setUint32(4, this.h1);
        dataView.setUint32(8, this.h2);
        dataView.setUint32(12, this.h3);
        dataView.setUint32(16, this.h4);
        dataView.setUint32(20, this.h5);
        dataView.setUint32(24, this.h6);
        if (!this.is224) {
            dataView.setUint32(28, this.h7);
        }
        return buffer;
    };

    function HmacSha256(key, is224, sharedMemory) {
        var i, type = typeof key;
        if (type === 'string') {
            var bytes = [], length = key.length, index = 0, code;
            for (i = 0; i < length; ++i) {
                code = key.charCodeAt(i);
                if (code < 0x80) {
                    bytes[index++] = code;
                } else if (code < 0x800) {
                    bytes[index++] = (0xc0 | (code >> 6));
                    bytes[index++] = (0x80 | (code & 0x3f));
                } else if (code < 0xd800 || code >= 0xe000) {
                    bytes[index++] = (0xe0 | (code >> 12));
                    bytes[index++] = (0x80 | ((code >> 6) & 0x3f));
                    bytes[index++] = (0x80 | (code & 0x3f));
                } else {
                    code = 0x10000 + (((code & 0x3ff) << 10) | (key.charCodeAt(++i) & 0x3ff));
                    bytes[index++] = (0xf0 | (code >> 18));
                    bytes[index++] = (0x80 | ((code >> 12) & 0x3f));
                    bytes[index++] = (0x80 | ((code >> 6) & 0x3f));
                    bytes[index++] = (0x80 | (code & 0x3f));
                }
            }
            key = bytes;
        } else {
            if (type === 'object') {
                if (key === null) {
                    throw new Error(ERROR);
                } else if (ARRAY_BUFFER && key.constructor === ArrayBuffer) {
                    key = new Uint8Array(key);
                } else if (!Array.isArray(key)) {
                    if (!ARRAY_BUFFER || !ArrayBuffer.isView(key)) {
                        throw new Error(ERROR);
                    }
                }
            } else {
                throw new Error(ERROR);
            }
        }

        if (key.length > 64) {
            key = (new Sha256(is224, true)).update(key).array();
        }

        var oKeyPad = [], iKeyPad = [];
        for (i = 0; i < 64; ++i) {
            var b = key[i] || 0;
            oKeyPad[i] = 0x5c ^ b;
            iKeyPad[i] = 0x36 ^ b;
        }

        Sha256.call(this, is224, sharedMemory);

        this.update(iKeyPad);
        this.oKeyPad = oKeyPad;
        this.inner = true;
        this.sharedMemory = sharedMemory;
    }

    HmacSha256.prototype = new Sha256();

    HmacSha256.prototype.finalize = function () {
        Sha256.prototype.finalize.call(this);
        if (this.inner) {
            this.inner = false;
            var innerHash = this.array();
            Sha256.call(this, this.is224, this.sharedMemory);
            this.update(this.oKeyPad);
            this.update(innerHash);
            Sha256.prototype.finalize.call(this);
        }
    };

    var exports = createMethod();
    exports.sha256 = exports;
    exports.sha224 = createMethod(true);
    exports.sha256.hmac = createHmacMethod();
    exports.sha224.hmac = createHmacMethod(true);

    if (COMMON_JS) {
        module.exports = exports;
    } else {
        root.sha256 = exports.sha256;
        root.sha224 = exports.sha224;
        if (AMD) {
            define(function () {
                return exports;
            });
        }
    }
})();

onmessage = function(event){
    var data=event.data;
    var i=0;
    var string = "0";
    var add = "0";
    for (var j = 0; j < data.difficulty - 1; j++) {
        string += add;
    }
    while (sha256(data.hash + i).substring(0, parseInt(data.difficulty)) !== string) {
        i++
    }
    console.log(sha256(data.hash + i))
    console.log(sha256(data.hash + i))
// 向线程创建者返回消息
    postMessage(i);
}